Grand canyon, AZ: Grand Canyon Natural History Association, 1990. Second edition. Thick quarto [29.5 cm] Text housed in a loose-leaf binder. Index tabs. Very good condition. The pages are clean. May require extra postage due to weight. Item #35458
Grand Canyon Natural History Association Monograph Number 8. With contributions by George H. Billingsley, William J. Breed, Robert C. Euler, Dorothy A. House and others.